<rss version="2.0" xmlns:atom="https://www.w3.org/2005/Atom">
  <channel>
    <title>Transport Research International Documentation (TRID)</title>
    <link>https://trid.trb.org/</link>
    <atom:link href="https://trid.trb.org/Record/RSS?s=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" rel="self" type="application/rss+xml" />
    <description></description>
    <language>en-us</language>
    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
    <image>
      <title>Transport Research International Documentation (TRID)</title>
      <url>https://trid.trb.org/Images/PageHeader-wTitle.jpg</url>
      <link>https://trid.trb.org/</link>
    </image>
    <item>
      <title>APPLICATION OF A STRUCTURAL-ACOUSTIC DIAGNOSTIC TECHNIQUE TO REDUCE BOOM NOISE IN A PASSENGER VEHICLE</title>
      <link>https://trid.trb.org/View/175500</link>
      <description><![CDATA[This paper is No. 81011.  Body "boom" is a structurally generated noise that can be excited in a passenger vehicle by road roughness or powertrain vibration.  It typically occurs in a frequency band below 200 hz and results when the input forces to the body structure are transmitted to the wall panels around the passenger compartment which, in turn, vibrate and excite the acoustic modes of the compartment cavity.  This paper concerns the diagnoiss of boom noise which is excited by engine vibration.  Several approaches have been described in the literature for reducing engine induced boom noise.  These include reducing the input excitation of the engine to the body structure by use of a vibration absorber, adjusting the engine mounts to tune the engine vibration for minimum acoustic participation, and the use of a Helmholtz resonator to modify the acoustic response of the compartment cavity.  Another approach, which is the topic of this paper, is to identify and alter the structural wall panels which excite the boom noise. T his approach has been applied successfully to reduce boom noise generated by road input and is based on the use of a finite element model of the compartment cavity to determine the panel participations in exciting the acoustic modes.  A diagnostic technique for noise reduction based on the use of the finite element model together with experimental panel vibration data has been developed, and its application is described in this paper.  (Author/TRRL)]]></description>
      <pubDate>Fri, 28 May 1982 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/175500</guid>
    </item>
    <item>
      <title>APPLICATION OF A STRUCTURAL-ACOUSTIC DIAGNOSTIC TECHNIQUE TO REDUCE BOOM NOISE IN A PASSENGER VEHICLE</title>
      <link>https://trid.trb.org/View/173557</link>
      <description><![CDATA[An acoustic finite element capability and a Fourier analysis capability are employed to identify the structural areas that cause boom noise in a vehicle.  The noise occurs in the 127-140 Hz frequency range and results from the forces transmitted to the body structure from the vibration of the engine on its mounts.  The phenomenon is diagnosed as being caused by panel vibrations exciting the second longitudinal acoustic resonance of the passenger compartment.  Several panels around the front of the compartment are identified as being significant to the excitation of this resonance, and weights are added to various panels to change their vibration characteristics.]]></description>
      <pubDate>Fri, 29 Jan 1982 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/173557</guid>
    </item>
  </channel>
</rss>